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diff --git a/dom/file/ipc/mozIRemoteLazyInputStream.idl b/dom/file/ipc/mozIRemoteLazyInputStream.idl
new file mode 100644
index 0000000000..8303b2e0fc
--- /dev/null
+++ b/dom/file/ipc/mozIRemoteLazyInputStream.idl
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIInputStream;
+
+/*
+ * A simple interface to get the underlying stream from an
+ * RemoteLazyInputStream.
+ */
+[scriptable, builtinclass, uuid(4125585f-b0c2-4964-a83c-4b0d99f26d49)]
+interface mozIRemoteLazyInputStream : nsISupports
+{
+  /**
+   * Attempts to take the internal stream out of this mozIRemoteLazyInputStream.
+   * Throws NS_BASE_STREAM_WOULD_BLOCK if the stream isn't available yet, and
+   * NS_BASE_STREAM_CLOSED if it was already closed.
+   */
+  [noscript] nsIInputStream TakeInternalStream();
+
+  /**
+   * If this RemoteLazyInputStream is actively backed by an actor, get the
+   * underlying actor's ID. Will throw if the underlying actor is no longer
+   * available.
+   */
+  [noscript] readonly attribute nsIDRef internalStreamID;
+};